Imaging system

Abstract

An imaging system includes an image carrier to carry a toner image, and a transfer medium having a transfer surface to receive the toner image from the image carrier. The transfer surface of the transfer medium has a resistance component of 14.6 to 17.7 log Ω·cm for an alternating current having a frequency range of 1 mHz to 1 Hz.

The invention claimed is: 
     
       1. An imaging system comprising:
 an image carrier to carry a toner image; and 
 a transfer medium having a transfer surface to receive the toner image from the image carrier, wherein the transfer surface has a resistance component of 14.6 to 17.7 log Ω·cm for an alternating current having a frequency range of 1 mHz to 1 Hz. 
 
     
     
       2. The imaging system according to  claim 1 ,
 wherein the transfer medium includes a first layer which includes the transfer surface and a second layer which is adjacent to the first layer, and 
 wherein the transfer medium formed by the first layer and the second layer, is imparted with the resistance component of 14.6 to 17.7 log Ω·cm for the alternating current in the frequency range of 1 mHz to 1 Hz. 
 
     
     
       3. The imaging system according to  claim 2 ,
 wherein a layer thickness of the first layer is larger than 1 μm and smaller than 20 μm. 
 
     
     
       4. The imaging system according to  claim 2 ,
 wherein a resistance component [log Ω·cm] of the transfer medium for an alternating current having a frequency range of 1 Hz to 1 kHz is less than the resistance component of the transfer medium for the alternating current having a frequency range of 1 mHz to 1 Hz. 
 
     
     
       5. An imaging system comprising:
 an endless belt which includes a transfer surface to convey a toner image in a conveying direction, wherein the transfer surface has a resistance component of 14.6 to 17.7 log Ω·cm for an alternating current having a frequency range of 1 mHz to 1 Hz; 
 an image carrier to transfer the toner image onto the transfer surface of the endless belt and to rotate about a rotation shaft; and 
 a pressing roller to press the endless belt against the image carrier, wherein the pressing roller includes a rotation shaft located at a downstream side in the conveying direction of the endless belt in relation to the rotation shaft of the image carrier. 
 
     
     
       6. The imaging system according to  claim 5 ,
 wherein the endless belt includes a first linear portion adjacent an upstream side of the image carrier, and a second linear portion adjacent a downstream side of the pressing roller, and 
 wherein the second linear portion is offset with respect to the first linear portion in a direction perpendicular to the first linear portion of the endless belt. 
 
     
     
       7. The imaging system according to  claim 6 ,
 wherein the endless belt includes a non-linear portion to travel along a surface of the image carrier between the first linear portion and the second linear portion. 
 
     
     
       8. The imaging system according to  claim 7 ,
 wherein a length of the non-linear portion along the conveying direction of the endless belt is approximately 2.5 mm to 5 mm. 
 
     
     
       9. The imaging system according to  claim 5 ,
 wherein the endless belt includes a linear portion located on an upstream side of the image carrier, 
 wherein the pressing roller contacts the endless belt at a contact portion of the endless belt, and 
 wherein the contact portion of the endless belt is offset from the linear portion of the endless belt in a direction perpendicular to the linear portion. 
 
     
     
       10. The imaging system according to  claim 9 ,
 wherein the contact portion of the endless belt is offset from the linear portion of the endless belt in a direction perpendicular to the linear portion, toward the rotation shaft of the image carrier to direct a pressed portion of the endless belt to contact the image carrier along a curved surface of the image carrier. 
 
     
     
       11. The imaging system according to  claim 5 ,
 wherein the endless belt includes a first layer which includes the transfer surface and a second layer which is adjacent to the first layer. 
 
     
     
       12. The imaging system according to  claim 11 ,
 wherein a layer thickness of the first layer is between approximately 1 μm and 20 μm. 
 
     
     
       13. The imaging system according to  claim 11 ,
 wherein a resistance component [log Ω·cm] of the endless belt, for an alternating current having a frequency range of 1 Hz to 1 kHz is less than the resistance component of the endless belt for the alternating current having the frequency range of 1 mHz to 1 Hz. 
 
     
     
       14. An imaging system comprising:
 an endless belt to convey a toner image in a conveying direction; 
 an image carrier to transfer the toner image onto the endless belt and rotates about a rotation shaft; and 
 a pressing roller to press the endless belt against the image carrier, wherein the pressing roller includes a rotation shaft located at a downstream side of the rotation shaft of the image carrier, in the conveying direction of the endless belt, 
 wherein the endless belt includes a first linear portion adjacent an upstream side of the image carrier and a second linear portion adjacent a downstream side of the pressing roller, and 
 wherein the second linear portion is offset with respect to the first linear portion in a direction perpendicular to the first linear portion of the endless belt. 
 
     
     
       15. The imaging system according to  claim 14 ,
 wherein the endless belt includes a non-linear portion to travel along a surface of the image carrier between the first linear portion and the second linear portion.